در شرايط آب وهوايي خوزستان PF5407 تاثير سطوح مختلف نيتروژن و تراكم بوته بر عملكرد دانه كلزا رقم

Effect of different levels and plant density on grain yield of rapeseed, cultiv arpf 7045 in khuzestan conditons

In order to study the effect of N levels and optimum plant density on grain yield of rapeseed cultivar PF7045, a field experiment was conducted in 1998-1999 at Ramin Agricultural Research and Education Center, University of Shahid Charmran, Ahwaz. The design was a split plot in a completely randomized block bases with 4 replications. Main plots were consisted of 5 levels of N (45, 90, 135, 180 and 225 kgN/ha) and subplots of 3 plant densities (50, 70 and 90 plants/m2). Results showed that higher applications of N fertilizer up to 225 kgN/ha incrased grain yield (2980.9 kg/ha). The higher yield (2796.4 kg/ha) obtained from 90 plants/m2 denstiy. Interactive effect of N and planting density on grain yield was significant. Application of 225 kgN/ha at the highest density (90 plants/m2) produced 3301.0 kg/ha of grain. This results indicated that response of grain yield to different plant density was due to differences in N application rates. Among yield components, number of podslm2 and number of kernel per pod showed that the highest sensitivity to both plant density and N levels. The number of pods/rn2 incerased with increase in N levels and plant density while the number of kernels per pod decreased with increase in N levels and plant density. 1000 kernel weight increased with N levels and decreased with higher plant denstiy respectively. The highest of oil (45. 09%) was obtained from 45 kgN/ha at plants/m2 denstiy and the lowest amount oil (40.0%) obtained from application of 135 kgN/ha at 50 plants/m2 denstiy. This results showed that the effect of N levels on grain oil was more than plant density.